Statement of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Operations [Abstract]
Revenues	$ 176,238	$ 218,486	$ 187,196
Cost of Revenue	85,506	102,811	86,843
Gross Profit	90,732	115,675	100,353
Research and Development Expense	39,994	39,331	36,298
Selling, General and Administrative Expense	41,542	40,225	40,826
Amortization of Intangible Assets	2,592	1,853	1,757
Operating Expenses	84,128	81,409	78,881
Operating Income (Loss)	6,604	34,266	21,472
Interest Income (Expense), Net	5,079	4,377	1,925
Other Nonoperating Income (Expense)	(8)	482	(847)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	1,533	29,407	20,394
Income Tax Expense (Benefit)	(1,925)	(14,458)	(4,832)
Net Income (Loss) Attributable to Parent	$ 3,458	$ 43,865	$ 25,226
Earnings Per Share, Basic	$ 0.11	$ 1.36	$ 0.79
Earnings Per Share, Diluted	$ 0.10	$ 1.34	$ 0.78
Weighted Average Number of Shares Outstanding, Basic	32,783	32,226	31,744
Weighted Average Number of Shares Outstanding, Diluted	33,388	32,853	32,256